Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: /**********************************************************************
Chris@69:  * Correlation matrix computations for LS estimate.
Chris@69:  **********************************************************************/
Chris@69: 
Chris@69: #include "main_FLP.h"
Chris@69: 
Chris@69: /* Calculates correlation vector X'*t */
Chris@69: void silk_corrVector_FLP(
Chris@69:     const silk_float                *x,                                 /* I    x vector [L+order-1] used to create X       */
Chris@69:     const silk_float                *t,                                 /* I    Target vector [L]                           */
Chris@69:     const opus_int                  L,                                  /* I    Length of vecors                            */
Chris@69:     const opus_int                  Order,                              /* I    Max lag for correlation                     */
Chris@69:     silk_float                      *Xt                                 /* O    X'*t correlation vector [order]             */
Chris@69: )
Chris@69: {
Chris@69:     opus_int lag;
Chris@69:     const silk_float *ptr1;
Chris@69: 
Chris@69:     ptr1 = &x[ Order - 1 ];                     /* Points to first sample of column 0 of X: X[:,0] */
Chris@69:     for( lag = 0; lag < Order; lag++ ) {
Chris@69:         /* Calculate X[:,lag]'*t */
Chris@69:         Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L );
Chris@69:         ptr1--;                                 /* Next column of X */
Chris@69:     }
Chris@69: }
Chris@69: 
Chris@69: /* Calculates correlation matrix X'*X */
Chris@69: void silk_corrMatrix_FLP(
Chris@69:     const silk_float                *x,                                 /* I    x vector [ L+order-1 ] used to create X     */
Chris@69:     const opus_int                  L,                                  /* I    Length of vectors                           */
Chris@69:     const opus_int                  Order,                              /* I    Max lag for correlation                     */
Chris@69:     silk_float                      *XX                                 /* O    X'*X correlation matrix [order x order]     */
Chris@69: )
Chris@69: {
Chris@69:     opus_int j, lag;
Chris@69:     double  energy;
Chris@69:     const silk_float *ptr1, *ptr2;
Chris@69: 
Chris@69:     ptr1 = &x[ Order - 1 ];                     /* First sample of column 0 of X */
Chris@69:     energy = silk_energy_FLP( ptr1, L );  /* X[:,0]'*X[:,0] */
Chris@69:     matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy;
Chris@69:     for( j = 1; j < Order; j++ ) {
Chris@69:         /* Calculate X[:,j]'*X[:,j] */
Chris@69:         energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ];
Chris@69:         matrix_ptr( XX, j, j, Order ) = ( silk_float )energy;
Chris@69:     }
Chris@69: 
Chris@69:     ptr2 = &x[ Order - 2 ];                     /* First sample of column 1 of X */
Chris@69:     for( lag = 1; lag < Order; lag++ ) {
Chris@69:         /* Calculate X[:,0]'*X[:,lag] */
Chris@69:         energy = silk_inner_product_FLP( ptr1, ptr2, L );
Chris@69:         matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy;
Chris@69:         matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy;
Chris@69:         /* Calculate X[:,j]'*X[:,j + lag] */
Chris@69:         for( j = 1; j < ( Order - lag ); j++ ) {
Chris@69:             energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ];
Chris@69:             matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy;
Chris@69:             matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy;
Chris@69:         }
Chris@69:         ptr2--;                                 /* Next column of X */
Chris@69:     }
Chris@69: }